<template>
  <div>
    <p>请选择你要购买的书籍</p>
    <ul>
      <li v-for="(item, index) in arr" :key="index">
        {{ item.name }} <button @click="handleClick(index)">买书</button>
      </li>
    </ul>
    <table border="1" width="500" cellspacing="0">
      <thead>
        <tr>
          <th>序号</th>
          <th>书名</th>
          <th>单价</th>
          <th>数量</th>
          <th>合计</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.price }}</td>
          <td>{{ item.count }}</td>
          <td>{{ item.price * item.count }}</td>
        </tr>
      </tbody>
    </table>

    <p>总价格为: {{ total }}</p>
  </div>
</template>

<script>
export default {
  name: 'Mdslx',
  data() {
    return {
      arr: [
        {
          name: '水浒传',
          price: 107,
          count: 0,
        },
        {
          name: '西游记',
          price: 192,
          count: 0,
        },
        {
          name: '三国演义',
          price: 219,
          count: 0,
        },
        {
          name: '红楼梦',
          price: 178,
          count: 0,
        },
      ],
    }
  },
  computed: {
    total() {
      return this.arr.reduce((acc, cur) => acc + cur.price * cur.count, 0)
    },
  },
  methods: {
    handleClick(index) {
      this.arr[index].count++
    },
  },
}
</script>
